Microsoft does not officially support installing both 32-bit and 64-bit engines on the same OS simultaneously. However, for developers requiring both, there is a specific installation switch workaround (though it is officially unsupported and may have stability issues):
Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccessFile.accdb; Persist Security Info=False; 2016 access database engine
The Access Database Engine solves this by providing the underlying drivers (OLE DB and ODBC) necessary for data connectivity. Microsoft does not officially support installing both 32-bit
To install the engine correctly: